Method and system for data communication network in a vehicle

Abstract

Aspects of the present invention relate to a method of communication between a first electronic device operatively connected to a data communications network within a vehicle, and a second electronic device operatively connected to the data communications network, the method comprising: sending a first message between the first and second electronic devices, outputting a first control signal to cause the operative state of the first or second electronic device to be reset, in dependence on a response message not having been received within a time period equal to a predetermined time period threshold.

The invention claimed is: 
     
       1. A vehicle electronic control unit configured to be operatively connected to a data communications network within a vehicle, wherein the vehicle electronic control unit is configured to:
 transmit a first message to a further vehicle electronic control unit connected to the data communications network; and 
 output a first control signal to cause an operative state of the further vehicle electronic control unit to be reset, in dependence on the vehicle electronic control unit not having received a response message from the further vehicle electronic control unit within a time period from transmission of the first message that is equal to a predetermined time period threshold. 
 
     
     
       2. The vehicle electronic control unit of  claim 1 , wherein
 the first message comprises a current operative state of the vehicle electronic control unit; and 
 the vehicle electronic control unit is configured to transmit the first message in response to a request from the further vehicle electronic control unit for the current operative state of the vehicle electronic control unit. 
 
     
     
       3. The vehicle electronic control unit of  claim 1 , wherein
 the first message comprises a current operative state of the vehicle electronic control unit; 
 the vehicle electronic control unit is configured to receive a second control signal from the further vehicle electronic control unit indicating an expected operative state; and 
 upon receipt of the second control signal, the vehicle electronic control unit is configured to change the operative state of the vehicle electronic control unit from the current operative state to the expected operative state. 
 
     
     
       4. The vehicle electronic control unit of  claim 1 , wherein the first message comprises a request for a current operative state of the further vehicle electronic control unit. 
     
     
       5. The vehicle electronic control unit of  claim 4 , wherein,
 a response message responding to the first message comprises an indication of a current operative state of the further vehicle electronic control unit; and 
 upon receipt of the response message, the vehicle electronic control unit is configured to:
 determine if the current operative state of the further vehicle electronic control unit is consistent with an expected operative state of the further vehicle electronic control unit; and 
 output a second control signal to cause the operative state of the further vehicle electronic control unit to be changed to the expected operative state of the further vehicle electronic control unit, if the current operative state of the further vehicle electronic control unit is not consistent with the expected operative state of the further vehicle electronic control unit. 
 
 
     
     
       6. The vehicle electronic control unit of  claim 5 , wherein the vehicle electronic control unit is configured to:
 determine if the current operative state of the further vehicle electronic control unit is associated with a critical operation of the vehicle; and 
 output the second control signal once the critical operation has been completed. 
 
     
     
       7. The vehicle electronic control unit of  claim 4 , wherein the vehicle electronic control unit is configured to determine if the current operative state of the further vehicle electronic control unit is consistent with an expected operative state by:
 accessing a database comprising a real-time database record of the expected operative state of the further vehicle electronic control unit; and 
 comparing the current operative state of the further vehicle electronic control unit with the expected operative state associated with the real-time database record. 
 
     
     
       8. The vehicle electronic control unit of  claim 7 , wherein the vehicle electronic control unit is configured to:
 receive a signal from a remote vehicle electronic control unit located remotely from the vehicle, the signal specifying a desired operative state of the further vehicle electronic control unit; and 
 updating the expected operative state of the further vehicle electronic control unit in accordance with the desired operative state specified in the signal received from the remote vehicle electronic control unit. 
 
     
     
       9. An assembly comprising the vehicle electronic control unit of  claim 1  and the vehicle data communications network. 
     
     
       10. A vehicle comprising the vehicle electronic control unit of  claim 1 . 
     
     
       11. A vehicle electronic control unit configured to be operatively connected to a data communications network within a vehicle, wherein the vehicle electronic control unit is configured to:
 receive a first message from a further vehicle electronic control unit connected to the data communications network, wherein the first message comprises a current operative state of the further vehicle electronic control unit; 
 determine if the current operative state of the further vehicle electronic control unit is consistent with an expected operative state; and 
 output a response message to the further vehicle electronic control unit, the response message comprising a control signal to cause the operative state of the further vehicle electronic control unit to be changed to the expected operative state, if the current operative state of the further vehicle electronic control unit is not consistent with the expected operative state. 
 
     
     
       12. The vehicle electronic control unit of  claim 11 , wherein the vehicle electronic control unit is configured to
 determine if the current operative state of the further vehicle electronic control unit is associated with a critical operation of the vehicle; and 
 output the response message comprising the control signal to cause the operative state of the further vehicle electronic control unit to be changed to the expected operative state after the critical operation has been completed. 
 
     
     
       13. The vehicle electronic control unit of  claim 11 , wherein the vehicle electronic control unit is configured to determine if the current operative state of the further vehicle electronic control unit is consistent with the expected operative state by:
 accessing a database comprising a real-time database record of the expected operative state of the further vehicle electronic control unit; and 
 comparing the current operative state of the further vehicle electronic control unit with the expected operative state associated with the real-time database record. 
 
     
     
       14. The vehicle electronic control unit of  claim 13 , wherein the vehicle electronic control unit is configured to:
 receive a signal from a remote vehicle electronic control unit located remotely from the vehicle, the signal specifying a desired operative state of the further vehicle electronic control unit; and 
 updating the expected operative state of the further vehicle electronic control unit in accordance with the desired operative state specified in the signal received from the remote vehicle electronic control unit. 
 
     
     
       15. An assembly comprising the vehicle electronic control unit of  claim 11  and the vehicle data communications network. 
     
     
       16. A vehicle comprising the vehicle electronic control unit of  claim 11 . 
     
     
       17. A method of communication between a first vehicle electronic control unit operatively connected to a data communications network within a vehicle and a second vehicle electronic control unit operatively connected to the data communications network, the method comprising:
 transmitting a first message from the first vehicle electronic control unit to the second vehicle electronic control unit; and 
 outputting from the first vehicle electronic control unit a first control signal to cause an operative state of the second vehicle electronic control unit to be reset, in dependence on the first vehicle electronic control unit not having received a response from the second vehicle electronic control unit within a time period from transmission of the first message that is equal to a predetermined time period threshold. 
 
     
     
       18. A non-transitory storage medium containing a computer program comprising instructions for carrying out the method of  claim 17 .